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Posted Sat Oct 6, 2018 1:06 PM
Posted Sun Oct 7, 2018 7:39 AM
I have dozens of replacement keyboards, as the result of taking on people's collections.
PM me, I will share one, no cost.
If you just want the M key, thats ok too.
Now, those mods are pretty interesting. It looks like they brought out the video signals - my guess is composite on the BNC connector, and audio mini-phono plug.
The 25-pin D-sub connector might be a "Joy-Print" interface, a mod that allowed printing (originally out the 9-pin, D-sub, joystick side port). Others will know that better (I never used one.)
Hint: the 1983 author of Joy-Print is Urbite on this forum. Bit of TI-99/4A lore there.
The red button... you must push it and tell us what it does.
Two guesses: RESET button, or LOAD interrupt. The LOAD interrupt had many uses. One was to run software to print a screen dump. Requires 32k expansion to use because address $FFFC.
To figure out what you have, you'll need some schematics.
First, see the FAQ http://atariage.com/...ces-read-first/
I like Thierry Nouspikel's TI Tech Pages
And the original TI provided schematics are in this document:
Other upgrades on that MainByte page: http://www.mainbyte....99/upgrades.asp
Edited by FarmerPotato, Sun Oct 7, 2018 7:44 AM.
Posted Sun Oct 7, 2018 10:58 AM
There was an article I saw once in (I think) 99er for an alternative keyboard for the 99/4 that used the same 25-pin connector.
Posted Sun Oct 7, 2018 12:35 PM
I have a console with that mod to extend the keyboard on a 25-pin cable. It uses a standard TI keyboard in a box--but now you don't have to sit up close to the console to type.
Posted Mon Oct 8, 2018 8:38 AM
Posted Wed Oct 10, 2018 3:51 PM
Posted Sun Oct 14, 2018 6:00 PM
Well, I received a composite video cable today and tried both TI-99/4a on my 1702 and both work!
So now I need a few other thing:
A PEB (will know tomorrow if I got one)
A FinalGROM (next month)
A couple of good book on programming the TI (Asm and XB). I know there are some online, i may print them at work.
I know it's a bit silly if I get the finalgrom, but I want actual carts of the programming languages (XB, A/E etc) with docs if available.
The FinalGROM cartridge is the must have. I have not had to change a cartridge since I got it installed.
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